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Iriomotejima Onsen is a hot spring town in Okinawa, Japan. The water leaves the ground at 32.2°C, cool enough that the baths here are usually reheated. Officially the water is classed as sulfate spring.
Clear water with a faintly bitter taste. Known for holding heat.
Figures from the town's Japanese Wikipedia article.
24.3797, 123.9069 — open the map
Planning a first soak? Read how an onsen stay works, and what to do if you have tattoos.